Braun said he can’t get into details about the social media post. He can't say who made the post or what it said. But WLWT has learned the department is looking at an online comment made by a firefighter.

"It's something that's kind of new for us, because it's in the social network area now. So we will be taking our time seeing what to do," Braun said.

The firefighter’s comment was in response to another investigation involving police officer Freddie Vincent.

Braun said as public servants, his department is held to a higher standard and that's part of the reason for this internal investigation.

Vincent spoke exclusively to WLWT about the Facebook post where he told black men to comply with police orders if they're stopped by a white cop, because some police are "looking for a reason to kill a black man."

Click here for full story

While Braun can't confirm what led to the investigation of a firefighter, he said clear policies are in place about firefighter behavior, even if they don't specifically cover social media.

In the current climate, he would caution his firefighters to be thoughtful about what they post online.

"Our words have consequences and we have to watch what we say. What we do is dangerous in and of itself and we don't want to make it any more dangerous than it is," Braun said.

While not talking specifics, Braun said the stakes for rules violations are potentially quite high.

"It runs the whole gamut from just a verbal reprimand to dismissal," Braun said.

Braun said there is not specific timetable for when the investigation will be complete. He said it wants it done right.

While the details of the internal investigation are not available to us now, the chief said the results of the investigation will be public record.